The NASEM report [...] acknowledges the harm-reducing potential of e-cigarettes. "E-cigarette aerosol contains fewer numbers and lower levels of most toxicants than smoke from combustible tobacco cigarettes does," Eaton et al. say. "Laboratory tests of e-cigarette ingredients, in vitro toxicological tests, and short-term human studies suggest that e-cigarettes are likely to be far less harmful than combustible tobacco cigarettes."
EU e-Privacy Directive